SCHEDULE
Mornings
from 10:00 to 14:00
Evenings
from 17:30 to 20:00
Saturdays evenings CLOSED
- Acceso adaptado a personas con movilidad reducida.
- Access adapted for people with reduced mobility.
- Accès facilités aux personnes à mobilité réduit.
What Types Of Lenses Are Available?
Lenses are classified into plastic and glass and these can be further sub-divided into categories of thickness.
PLASTIC
These start at the basic or CR39 lens, which is the thickest type of lens available. The thickness is represented by the term 'index' and this basic lens has an index value of 1.49. At 20-20, all the other plastic lenses come with a standard anti-scratch and anti-reflection coating. The thinnest lens is the lens with the highest index, which is currently 1.74. Plastic lenses are thicker and less scratch resistant, but their lightness and impact resistance outweigh their disadvantages.
GLASS
Should your prescription be fairly high, your optometrist or dispenser may advise you to use glass lenses. Glass lenses are thinner and more scratch-resistant, but they are also more fragile and heavier. Plastic has 3x the impact of glass and is therefore a lot safer to wear. The impact now is 1.90.
Anti-Reflection Coating
This is a coating which cuts out useless rays of light bouncing off your spectacle lenses. The end result is that you will see more clearly as fewer reflective distractions exist and greater image contrast is obtained. Furthermore, you will look much better when you wear your specs as the traditional “glassy” appearance is eliminated.
As this is a standard coating that is worked into the lens while it is being made, it cannot be "added" to a normal lens surface nor can it be “topped up” on an old surface where the coating has come off.
Anti-Scratch Coating
This strengthens the outer surface of plastic lenses, but it is still a coating. One must take care not to confuse this with the term 'scratch-proof.' In time, all coatings come off and the same goes for anti-scratch coating.
Multifocal Spectacle Lenses
This term encompasses everything from bifocals to trifocals and varifocals. The Multifocal is a special type of lens, which is required mostly when the eyes get past 40-45 years of age. These allow the eyes to see objects clearly both far away and close up.
Multifocals are recommended for those individuals who possibly have both a distance and near prescription or they may only possess a near prescription. If their distance vision is perfect or zero, then they would use multifocals, so that they don't need to keep taking their glasses on and off.
Bifocals and trifocals both have lines across the lenses, which are visible when you look at them. They are still used, but in this aesthetically conscious millennium, more and more multifocal uses are switching to varifocals.
Varifocal spectacle lenses have no lines across them and look exactly like single focal lenses. Since there are no lines, it does take longer to figure out how to use them, but your optometrist and dispenser will advise you on the best way to adjust to them. Unlike the bifocals and trifocals, which work by changing powers the instant your eye crosses the line, varifocals progressively change power as one looks up or down the lens.
Sun-Reactive Spectacle Lenses
These are lenses that darken outdoor and lighten indoor. They are available in both glass and plastic form. They also have all the advantages of plastic lenses in that they are lightweight and safe. Thinner lens versions (high index) are now also available.
